Guessing the word

an extremely large, round mass of rock and metal, such as Earth, or of gas, such as Jupiter, that moves in a circular path around the sun or another star

e) to cause a liquid to change to a gas, especially by heating

without limits; extremely large or great

relating to the whole world; worldwide.

i) a situation in which a difficult choice has to be made between two different things you could do

the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.

f) the group of people who officially control a country

to fall or shrink together abruptly and completely

strange and not familiar

a) relating to trade, industry, or money

the lightest gas, has no color, taste, or smell, and combines with oxygen to form water

d) to make someone more likely to do something, or to make something more likely to happen

b) a real or imaginary straight line going through the center of a object that is spinning, or a line that divides a symmetrical shape into two equal halves

of or at a fairly low temperature.

c) a mixture of gases that surrounds any planet

a solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity